3.3.4.3 Selecting Particular Columns

If you do not want to see entire rows from your table, just
name the columns in which you are interested, separated by
commas. For example, if you want to know when your animals
were born, select the name and
birth columns:

Notice that the query simply retrieves the
owner column from each record, and some of
them appear more than once. To minimize the output, retrieve
each unique output record just once by adding the keyword
DISTINCT: